How to change the screen timeout duration on my Samsung Galaxy S II 4G

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To help save battery power, you can choose a lower screen timeout setting on your Samsung Galaxy S II 4G.
1. Touch Applications.
2. Touch Settings.
3. Scroll to and touch Display.
4. Scroll to and touch Screen timeout.
5. Touch the required setting (e.g. 30 seconds).
6. The screen timeout period has been set.